package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.common.BaseContext;
import com.itheima.common.CustomException;
import com.itheima.dao.OrderDao;
import com.itheima.entity.*;
import com.itheima.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderDao, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     *
     * @param orders
     */
    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id
        Long userId = BaseContext.getCurrentId();
        //查询当前用户的购物车对象 从属于某账号
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(wrapper);
// 生成订单 购物车不能是空
        if (shoppingCarts == null || shoppingCarts.size() == 0) {
            throw new CustomException("购物车为空，不能下单");
        }

        //查询用户数据
        User user = userService.getById(userId);

        //查询地址数据  ,用户地址不能为空
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if (addressBook == null) {
            throw new CustomException("用户地址信息有误，不能下单");
        }
        //订单号  生成订单号的方法 随机生成订单号
        long orderId = IdWorker.getId();
        //  金额
        AtomicInteger amount = new AtomicInteger(0);

        //组装订单明细信息
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            // 订单号
            orderDetail.setOrderId(orderId);
            // 订单数量
            orderDetail.setNumber(item.getNumber());
            // 菜品口味
            orderDetail.setDishFlavor(item.getDishFlavor());
            //菜品
            orderDetail.setDishId(item.getDishId());
            // 套餐
            orderDetail.setSetmealId(item.getSetmealId());
            // 菜品的名称
            orderDetail.setName(item.getName());
            //菜品/套餐图片
            orderDetail.setImage(item.getImage());
            // 金额
            orderDetail.setAmount(item.getAmount());
            // 金额计算 (单价*数量)
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        //组装订单数据
        //订单id
        orders.setId(orderId);
        //下单时间
        orders.setOrderTime(LocalDateTime.now());
        //结算时间
        orders.setCheckoutTime(LocalDateTime.now());
        //设置订单状态
        orders.setStatus(2);
        //总金额
        orders.setAmount(new BigDecimal(amount.get()));
        //下单用户的id
        orders.setUserId(userId);
        // 订单号 由 long转为 string
        orders.setNumber(String.valueOf(orderId));
        // 用户名称
        orders.setUserName(user.getName());
        //收货人名称
        orders.setConsignee(addressBook.getConsignee());
        //收货手机号码
        orders.setPhone(addressBook.getPhone());
        //收货地址(详细地址)
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        //向订单表插入数据，一条数据
        this.save(orders);
        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(wrapper);
    }
}